By MOSFET "ground" I think you mean the terminal marked "G" which is the gate, not ground. Connect the gates as shown; if the distance between the MOSFETs on your heatsink is less than 3 inches, no additional isolation is necessary.
R9, R11, and R13 (0.3 Ohm 10W) are connected in parallel to provide 0.1 Ohm 30W. You can use 1 of your 0.1 Ohm 50W resistors. Heatsinking your resistor is not required. The "S" means source, not sink. The "D" means drain.
Don't connect anything to pin 3 of VR1.
I should write a Theory of Operation for this circuit and email it to Jnbsystems so he can post it.
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